CVE-2023-53033 Information

Description

In the Linux kernel the following vulnerability has been resolved:

netfilter: nft_payload: incorrect arithmetics when fetching VLAN header bits

If the offset + length goes over the ethernet + vlan header then the length is adjusted to copy the bytes that are within the boundaries of the vlan_ethhdr scratchpad area. The remaining bytes beyond ethernet + vlan header are copied directly from the skbuff data area.

Fix incorrect arithmetic operator: subtract not add the size of the vlan header in case of double-tagged packets to adjust the length accordingly to address CVE-2023-0179.

Reference

https://git.kernel.org/stable/c/550efeff989b041f3746118c0ddd863c39ddc1aa https://git.kernel.org/stable/c/696e1a48b1a1b01edad542a1ef293665864a4dd0 https://git.kernel.org/stable/c/76ef74d4a379faa451003621a84e3498044e7aa3 https://git.kernel.org/stable/c/a8acfe2c6fb99f9375a9325807a179cd8c32e6e3